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How to open .C4G files on Windows

To open .C4G files on Windows, install/locate a Clonk/OpenClonk installation that includes the group tool (often named c4group.exe).

Step-by-step instructions

  1. Install/locate a Clonk/OpenClonk installation that includes the group tool (often named c4group.exe).
  2. Use the c4group tool to list or extract the .c4g contents (for example by running c4group.exe from the command line with appropriate options as documented by OpenClonk).
  3. If you only want to “use” the file in-game, put the .c4g where your Clonk/OpenClonk setup expects game data and launch the game (exact location/usage depends on the specific Clonk/OpenClonk setup).

Alternative methods

  • Open .C4G in a browser-based viewer if desktop apps fail.
  • Try opening .C4G on Windows with a secondary app to rule out app-specific issues.
  • Convert .C4G only with trusted tools when direct opening is not possible.

Common issues

The file opens in the wrong app or shows as an unknown file type

.c4g is a niche game-data container; many systems won’t have an associated app by default, and Linux association depends on MIME database entries and desktop configuration.

  1. Open it with the OpenClonk/Clonk group tool (c4group / c4group.exe) instead of trying a generic editor.
  2. On Linux, ensure your system recognizes it via the shared MIME-info mechanism and set the default app association if needed.

c4group cannot read the .c4g (errors, missing contents, or extraction fails)

This can happen if the file is incomplete/corrupted or not actually a valid Clonk/OpenClonk group file despite the extension.

  1. Re-download or re-copy the file to rule out transfer corruption (especially if it came from the internet or removable media).
  2. Try listing the archive contents first with c4group; if listing fails, the container is likely damaged or not a real group file.
  3. Confirm the file’s origin is Clonk/OpenClonk-related; if not, the extension may be misleading.

I expected to “play” it, but it looks like an archive

.c4g is usually a container of game assets; it’s often meant to be loaded by the Clonk/OpenClonk engine rather than opened as a document.

  1. If you have the game, try using it from within Clonk/OpenClonk (how depends on the specific game version/content).
  2. If you are modding or inspecting content, use c4group to extract the files, then open individual extracted resources with appropriate editors.

Security note

.c4g files are compressed containers (group files). Treat them like archives: extracting them can create many files, and their contents may include scripts or game logic intended for the Clonk/OpenClonk engine.

Back to .C4G extension page